I think a nice feature would be to get notifications on your device when a clan mate donates you some clan castle troops. I bet it would get quite annoying with a bunch of notifications, especially if you're receiving a bunch of troops that only cost 1 housing space. So I think it would be cool to have a feature where the player can choose whether they want to have that notify them or not. Or instead of a bunch of notifications it would be nice to have just one notification letting you know what you got. I don't know those are just my thoughts